IPACM: fix v6 wan link-down up issue

The DL filter rules installed in modem endpoints
are not clean when v6 backhaul is down, also the
v6 static rules installed in all LAN ifaces are
not clean. The fix is to avoid duplicate externed
property query and only install one sets of rules.

Change-Id: Iba305b32be3f6031894076eeeb212a9d6d4f6630
4 files changed
tree: 9d1ccd55b02d97a60b33c938c6cb0f7d901f2e09
  1. ipacm/
  2. ipanat/
  3. configure.ac
  4. Makefile.am